bei Google ScholarTitelangaben
Manderscheid, Bernhard ; Matzner, Egbert:
Auswirkungen unterschiedlicher Feinwurzelverteilungen und -biomassen auf das Risiko für Trockenstreß und Nadelverluste in Fichtenbeständen : Ergebnisse von Simulationsrechnungen zum Wasserhaushalt.
In: Forstwissenschaftliches Centralblatt.
Bd. 115
(1996)
.
- S. 350-362.
ISSN 0015-8003
DOI: https://doi.org/10.1007/BF02738614
Abstract
Chronic needle and leaf losses of major tree species, called "novel forest damage", are widespread inCentral Europe. Air pollutants are often blamed for this kind of damage. The influence of air pollutantdeposMon, soil chemical changes and the increasing nitrogen availability may cause a shallowing of theroot system and decreasing fine root blomass. We hypothesize that the changes in the root systemcause decreasing drought susceptability of the trees and needle or leaf losses.Using computer models for the watercycle in a mature Norway spruce stand over a period of 18years we quantified the influence of different rooting patterns on the transpiration and the risk ofdrought stress. Here we compared the dry year 1976 with the wet year 198t. In 1976 the simulatedxylem water potenuals indicate severe drought stress under conditions of shallow rooting and low rootbiomass. Under these rooting conditions the drought stress in 1976 would have been avoided, if thetrees had lost about 30% of the needle mass. During the wet year 1981 rooting patterns also influencedxylem water potentials, but severe drought stress did not occur.